[folding] Expose folding regions through executeFoldingRangeProvider

[patrys]

I maintain a code structure visualizing plugin (Code Outline) that would benefit from having access to the named regions introduced in one of the recent versions (see related issue).

[patrys]

Now that the folding API is stable, could we get an executeFoldingRangeProvider extended command?

[aeschli]

@patrys Will look into it ASAP

[SimonSiefke]

This would also be useful for testing folding ranges with vscode-test.

[octref]

Ping @aeschli, would want this to do E2E test for language servers.

[ihdavids]

Determining which rows are currently folded or being able to test if a region is currently folded would be a huge benefit to some plugins.

[allisonchou]

@aeschli is there an ETA for this work? This would be very helpful for the Razor team.

[aeschli]

There's now a command vscode.executeFoldingRangeProvider returning the folding ranges from providers or from the default provider (indentation based). Ranges are sanitized (duplicates and overlapping ranges removed) and follows the settings editor.folding, editor.foldingStrategy and editor.defaultFoldingRangeProvider

[jrieken]

verified in source code